package demo6;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class test1 {
    public static void main(String[] args) throws SQLException {
        //1.找到数据库服务器
        DataSource dataSource = new MysqlDataSource();
        ((MysqlDataSource)dataSource).setUrl("jdbc:mysql://127.0.0.1:3306/test2?characterEncoding=utf8&useSSL=false");
        ((MysqlDataSource)dataSource).setUser("root");
        ((MysqlDataSource)dataSource).setPassword("1234");

        //2.与数据库建立连接
        Connection connection = dataSource.getConnection();

        //3.构造sql语句
        String sql = "select id from student";
        PreparedStatement statement = connection.prepareStatement(sql);

        //4.执行sql语句
        ResultSet resultSet = statement.executeQuery();
        while(resultSet.next()) {
            int id = resultSet.getInt("id");
//            String name = resultSet.getString("name");
//            System.out.println("id = " + id + ",name = " + name);
            System.out.println("id = " + id);
        }


        //5.关闭连接释放资源
        resultSet.close();
        statement.close();
        connection.close();
    }
}
